High voltage thermostats: A Complete Guide

High voltage thermostats, also called line thermostats, are commonly used to regulate the temperature of various heating systems, such as those with the baseboard, forced fan, and convection fans, as well as radiant ceiling installations. More details on the benefits of these tools are provided below.


High voltage thermostats convert the 240v or 120v incoming electricity to useful heat. Under the hood, they are often larger than low-voltage thermostats. Due to the active current that flows through them, they function as heat sinks. The current provides power to the devices without the need for a battery. 

In contrast, low-voltage thermostats operate by power theft. This technology enables thermostats to function on tiny batteries and recharge with minimal electricity from the main line. 

High voltage systems have the disadvantage of requiring at least one high voltage smart thermostat per room or heater. 

How to determine whether your system has a low or high-pressure thermostat?

You can tell by looking at the wires if you have a high-voltage or low-voltage thermostat. Several tiny, brightly colored cables connect a low-voltage thermostat’s circuit board’s settings to your home’s temperature control system. High voltage thermostats have anything from two to four thick wires, typically color-coded in groups of either black and white or black and red. If you need help locating these controls, an HVAC technician can assist. 

As a bonus, the high-pressure smart thermostat is designed to work with your high-pressure heating system. It serves a useful purpose that helps people save time and effort.

Verify Your Thermostat’s Voltage 

Check the voltage to discover whether your thermostat is a line voltage thermostat: 

  • Voltage meter: Use a voltage meter to determine the amount of electric voltage that flows through your thermostat. When employing this kind of research, it is vital to adhere to rigorous safety requirements.

  • Label: Simply reading the label is a simple and secure approach to determining the thermostat’s voltage. If your thermostat is a line voltage thermostat, the label will have a warning about “high voltage.” Typically, the label will be visible and located beneath the lid of high-voltage thermostats. 

Varieties of Thermostats 

Manual thermostats are the simplest thermostat and have knobs or push buttons with display displays. They enable you to specify a preferred temperature and activate the heater or air conditioner when it exceeds or falls below the specified point. 

Programmable thermostats consist of push buttons with display panels or touchscreens. The regulated settings might help you save money on heating and cooling costs. These thermostats may be configured to operate during peak hours and to reduce their output during periods of low activity. Numerous programmable thermostats provide a hold mode that maintains a predetermined temperature for longer periods, such as long weekends when your office is unoccupied. 

A wireless smart thermostat functions similarly to a programmed thermostat. While modern thermostat wall units often have digital touchscreens, you can connect a smartphone or tablet to them. This feature would allow maintenance personnel to alter temperature settings from their mobile devices. These thermostats might also link to conference room tablets, allowing temperature adjustments without needing a wall-mounted thermostat. Due to the ease of access to the thermostat, your firm might reduce its energy expenses. 

Digital thermostats 

Traditional thermostats have provided comfort to numerous homes for many years, but there is no disputing that “smart” heating and other home gadgets are the current trends. There are smart televisions, speakers, refrigerators, lighting, and every other imaginable smart item. This is owing to the increasing popularity of smart homes, in which homeowners may manage all their home devices using voice commands and artificial intelligence. 

This means that you can now use your voice to switch on the lights, lock the doors, and adjust the temperature! 

People desire smart homes for various reasons, but turning “smart” is a terrific way to make your house more energy-efficient. 

Why Be Smart? 

If your conventional thermostat is still functioning properly, you may ask why you need a smart thermostat. Consider purchasing a smart thermostat for your line voltage system for the following reasons: 

  • Minimize energy usage

Smart thermostats are manufactured and intended to be energy efficient, supplying just the necessary heat and shutting off once the desired temperature is reached, minimizing energy usage. Thermostats lower energy expenses by ten to twelve percent for heating and fifteen percent for cooling. That’s around $131-$145 in annual savings. 

  • Scheduling

Typically, line voltage systems are multi-zone systems, meaning that each thermostat operates independently of the others. However, setting your thermostats each morning and night is tedious. With a line voltage smart thermostat, you may plan these daily adjustments simultaneously using their app, saving you a great deal of time. 

  • Remote access

Wireless smart thermostats typically feature apps that can be put on your mobile device, allowing you to remotely program temperature adjustments. However, you may access your devices using a web portal. This means that if you are away from home for an extended period, you can still control and monitor your gadgets from anywhere on the globe! 

Smart thermostats are an excellent method to save money on your home’s energy expenses. Thermostats with intelligence have many more functions than merely managing the temperature. Typically, the user may install a smart thermostat by simply replacing the old, “dumb” thermostat with a smart thermostat. Most wireless smart thermostats require a C wire (common wire) to receive electricity. Older systems without this line are the exception (for the wireless connection, display, etc.). If your HVAC system lacks the C wire, you must call an electrician or install an alternative power source.

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